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Clarify one magic constant.

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This commit is contained in:
Thomas Harte
2025-09-09 13:44:31 -04:00
parent 5125ff6a8c
commit 4a573a5aae
1 changed files with 9 additions and 4 deletions
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Machines/PCCompatible/KeyboardController.hpp
+9 -4
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@@ -282,6 +282,10 @@ private:
ResetBlockBegin = 0xf0,
};
enum Control: uint8_t {
InhibitKeyboard = 0x10,
};
static constexpr bool requires_parameter(const Command command) {
return
(command >= 0x60 && command < 0x80) ||
@@ -368,15 +372,16 @@ private:
transmit(0); // i.e. no issues uncovered.
break;
case Command::ReadTestInputs:
transmit((control_ & 0x10) ? 0x01 : 0x00);
// b0 is the keyboard clock; ensure it's inhibited when asked but otherwise don't attempt realism.
transmit((control_ & Control::InhibitKeyboard) ? 0x00 : 0x01);
break;
case Command::DisableKeyboard:
control_ |= 0x10;
control_ |= Control::InhibitKeyboard;
check_irqs();
break;
case Command::EnableKeyboard:
control_ &= ~0x10;
control_ &= ~Control::InhibitKeyboard;
check_irqs();
break;
@@ -478,7 +483,7 @@ private:
}
bool has_keyboard_output() const {
return keyboard_.output().has_output() && !(control_ & 0x10);
return keyboard_.output().has_output() && !(control_ & Control::InhibitKeyboard);
}
bool has_output() const {